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But the pig wars are moving north. In Michigan, New Hampshire, New York, North Dakota, Ohio, Oregon and Pennsylvania — where not long ago the only pigs were of the “Charlotte’s Web” variety — state officials are scrambling to deal with an invasion of roaming behemoths that rototill fields, dig up lawns, ruin wetlands, kill livestock, spread diseases such as pseudo-rabies and, occasionally, attack humans.

Finding faces in real time that can cause an alert is not practical with the cameras that are used by companies and organizations today, said Paul Schuepp, CEO of Animetrics in New Hampshire, but it... 0